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The rcutorture scripting tools automatically create an initrd containing
a single statically linked binary named "init" that loops over a
very long sleep() call. In both cases, this creation is done by
tools/testing/selftests/rcutorture/bin/mkinitrd.sh.
However, if you don't like the notion of statically linked bare-bones
userspace environments, you might wish to press an existing initrd
into service:
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cd tools/testing/selftests/rcutorture
zcat /initrd.img > /tmp/initrd.img.zcat
mkdir initrd
cd initrd
cpio -id < /tmp/initrd.img.zcat
# Manually verify that initrd contains needed binaries and libraries.
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